Gallery View:World landmarks switch off for Earth Hour

This combo image shows the lights of the Burj Khalifa tower lit up (TOP) before being switched off for an hour in Downtown Dubai, on March 23, 2013, as iconic landmarks and skylines are plunged into darkness as the "Earth Hour" switch-off of lights around the world got under way to raise awareness of climate change. AFP PHOTO/KARIM SAHIB

This combo image shows the lights of the Burj Khalifa tower lit up (TOP) before being switched off for an hour in Downtown Dubai, on March 23, 2013, as iconic landmarks and skylines are plunged into darkness as the "Earth Hour" switch-off of lights around the world got under way to raise awareness of climate change. AFP PHOTO/KARIM SAHIB